Enhanced strength-ductility synergy in a gradient pseudo-precipitates heterostructured Al-2.5％Mg alloy:Design,fabrication,and deformation mechanism

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外文摘要：Heterostructures of alloyed composites,comprising heterogeneous domains with dramatically different constitutive properties,hold remarkable potential to expand the realm of material design systems and resolve the trade-off between strength and ductility.This study introduces an innovative materials de-sign method for synthesizing gradient pseudo-precipitates heterostructure(GPHS)in non-heat-treatable Al-2.5％Mg alloys.Utilizing cost-effective mild steel as both the diffusion source and protective layer,this heterostructure is achieved through pin-less friction stir-assisted cyclic localized deformation pro-cess.Exogenous Fe atoms diffuse across the interface by friction stir-induced heat conduction,forming Fe-Al second-phase particles in the Al alloy matrix.A rapid inter-diffusion mechanism is activated in conjunction with dense dislocation walls,grain boundaries,and sub-structures,resulting in the forma-tion of pseudo-precipitates.These pseudo-precipitates are ultimately dispersed in a gradient distribution throughout the entire thickness of the Al alloy matrix induced by localized incremental deformation.The GPHSed Al-2.5％Mg alloy exhibits an enhanced synergy of strength and ductility,with a uniform elonga-tion increase from 11％to 21.2％,while maintaining the strength.Multiple strengthening and hardening mechanisms,such as solid solution strengthening,dislocation hardening,and second phase strengthen-ing,work synergistically to promote mechanical performance.Notably,the hetero-deformation between hard pseudo-precipitates and soft Al alloy matrix induces additional strain hardening,leading to high ductility.This work provides a fresh perspective on the design and fabrication of high-performance alloys with advanced heterostructures,especially for non-heat-treatable alloys.

外文关键词：

Gradient pseudo-precipitatesheterostructureEnhanced strength-ductility synergyRapid diffusionHetero-deformation induced strainhardeningAl-2.5％Mg alloy

作者：

Renhao Wu、Yeon Taek Choi、Qingfeng Wu、Xinxi Liu、Dayong An、Tianle Li、Meng Li、Hyoung Seop Kim

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作者单位：

Department of Plasticity Technology,School of Materials Science & Engineering,Shanghai Jiao Tong University,Shanghai 200030,China

Graduate Institute of Ferrous & Eco Materials Technology,Pohang University of Science and Technology,37673,South Korea

Department of Materials Science and Engineering,Pohang University of Science and Technology(POSTECH),37673,South Korea

School of Materials Science & Engineering,Changsha University of Science & Technology,Changsha 410114,China

Advanced Institute for Materials Research(WPI-AIMR),Tohoku University,Sendai 980-8577,Japan

Institute for Convergence Research and Education in Advanced Technology,Yonsei University,Seoul 03722,South Korea

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基金：

National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIP)National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIP)Brain Pool Program through the National Research Foundation of Korea

项目编号：

NRF-2021R1A2C3006662NRF-2022R1A5A1030054NRF-RS202300263999

出版年：

2024

DOI：

10.1016/j.jmst.2024.01.073

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.196(29)